CVE-2020-25656
A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access
02 Description
A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.43% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 37.9% of scored records. A rank, not a probability.
- NVD base score
- 4.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-12-02 00:00Z5 YR AGO
- Last updated
- 2024-08-04 15:40Z2 YR AGO
- Reserved
- 2020-09-16
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.1
- Document digest
- 9357d99408548cdf3a1802b26f4b5bdc02023de267965e871324b77c13185acd
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1888726
- lkml.orghttps://lkml.org/lkml/2020/10/29/528
- lkml.orghttps://lkml.org/lkml/2020/10/16/84
- lists.debian.org[debian-lts-announce] 20201210 [SECURITY] [DLA 2483-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- lists.debian.org[debian-lts-announce] 20201218 [SECURITY] [DLA 2494-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- www.starwindsoftware.comhttps://www.starwindsoftware.com/security/sw-20210325-0006/
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-553.el8_10
- kernel Fixed in 4.18.0-553.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.el8_10
- kernel-core Fixed in 4.18.0-553.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.el8_10
- kernel-debug Fixed in 4.18.0-553.el8_10
- kernel-debug-core Fixed in 4.18.0-553.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.el8_10
- kernel-devel Fixed in 4.18.0-553.el8_10
- kernel-doc Fixed in 4.18.0-553.el8_10
- kernel-headers Fixed in 4.18.0-553.el8_10
- kernel-modules Fixed in 4.18.0-553.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.el8_10
- kernel-rt Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-core Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-tools Fixed in 4.18.0-553.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.el8_10
- perf Fixed in 4.18.0-553.el8_10
- python3-perf Fixed in 4.18.0-553.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- bpftool Fixed in 4.18.0-553.el8_10
- kernel Fixed in 4.18.0-553.el8_10
- kernel-abi-stablelists Fixed in 4.18.0-553.el8_10
- kernel-core Fixed in 4.18.0-553.el8_10
- kernel-cross-headers Fixed in 4.18.0-553.el8_10
- kernel-debug Fixed in 4.18.0-553.el8_10
- kernel-debug-core Fixed in 4.18.0-553.el8_10
- kernel-debug-devel Fixed in 4.18.0-553.el8_10
- kernel-debug-modules Fixed in 4.18.0-553.el8_10
- kernel-debug-modules-extra Fixed in 4.18.0-553.el8_10
- kernel-devel Fixed in 4.18.0-553.el8_10
- kernel-doc Fixed in 4.18.0-553.el8_10
- kernel-headers Fixed in 4.18.0-553.el8_10
- kernel-modules Fixed in 4.18.0-553.el8_10
- kernel-modules-extra Fixed in 4.18.0-553.el8_10
- kernel-rt Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-core Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-core Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-devel Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-kvm Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-modules Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-debug-modules-extra Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-devel Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-kvm Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-modules Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-rt-modules-extra Fixed in 4.18.0-553.rt7.342.el8_10
- kernel-tools Fixed in 4.18.0-553.el8_10
- kernel-tools-libs Fixed in 4.18.0-553.el8_10
- kernel-tools-libs-devel Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-core Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-devel Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-modules Fixed in 4.18.0-553.el8_10
- kernel-zfcpdump-modules-extra Fixed in 4.18.0-553.el8_10
- perf Fixed in 4.18.0-553.el8_10
- python3-perf Fixed in 4.18.0-553.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- linux Fixed in 5.9.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.9.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.9.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux Fixed in 4.4.0-198.230
- linux-aws Fixed in 4.4.0-1119.133
- linux-aws-hwe Fixed in 4.15.0-1091.96~16.04.1
- linux-azure Fixed in 4.15.0-1103.114~16.04.1
- linux-gcp Fixed in 4.15.0-1091.104~16.04.1
- linux-hwe Fixed in 4.15.0-129.132~16.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.4.0-1085.94
- linux-oracle Fixed in 4.15.0-1062.68~16.04.1
- linux-raspi2 Fixed in 4.4.0-1143.153
- linux-snapdragon Fixed in 4.4.0-1147.157
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- linux Fixed in 4.15.0-129.132
- linux-aws Fixed in 4.15.0-1091.96
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1034.35~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1103.114
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1035.36~18.04.1
- linux-azure-edge No fix yet
- linux-dell300x Fixed in 4.15.0-1010.14
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1091.104
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1033.35~18.04.1
- linux-gcp-edge No fix yet
- linux-gke-4.15 Fixed in 4.15.0-1077.82
- linux-gke-5.4 Fixed in 5.4.0-1033.35~18.04.1
- linux-gkeop-5.4 Fixed in 5.4.0-1008.9~18.04.1
- linux-hwe No fix yet
- linux-hwe-5.4 Fixed in 5.4.0-59.65~18.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.15.0-1082.84
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1062.68
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1034.36~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1026.29~18.04.1
- linux-raspi2 Fixed in 4.15.0-1077.82
- linux-snapdragon Fixed in 4.15.0-1094.103
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- linux Fixed in 5.4.0-59.65
- linux-aws Fixed in 5.4.0-1034.35
- linux-azure Fixed in 5.4.0-1035.36
- linux-gcp Fixed in 5.4.0-1033.35
- linux-hwe-5.8 Fixed in 5.8.0-44.50~20.04.1
- linux-kvm Fixed in 5.4.0-1031.32
- linux-oem-5.6 Fixed in 5.6.0-1050.54
- linux-oracle Fixed in 5.4.0-1034.36
- linux-raspi Fixed in 5.4.0-1026.29
- linux-raspi2 No fix yet
- linux-riscv Fixed in 5.4.0-40.45
- linux-riscv-5.8 Fixed in 5.8.0-17.19~20.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux-intel-iot-realtime No fix yet
- linux-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- linux-raspi-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- linux No fix yet
- linux-aws Fixed in 4.4.0-1083.87Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1103.114~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial Fixed in 4.4.0-198.230~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- linux-azure-fde-5.15 Fixed in 5.15.0-1114.123~20.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 16.04 LTS
- linux-fips Fixed in 4.4.0-1052.58Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2034.35Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2016.18Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1049.56Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1069.73+fips2Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1073.76+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1067.71~20.04.1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 16.04 LTS
- linux-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 18.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 20.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.